The (Mostly) True Story of Hobo Graffiti

Hobos have been around since the railroad system made traveling across America possible. Itinerant workers rode the rails to where work was available, as best they could. Their numbers grew when unemployment did, and they developed a system leave messages for each other. Or did they? Historians know that the "hobo code" we've all read about is not what we've been told. (via Kottke)